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Toward a methodology to explore historical groundwater level trends and their origin: the case of Quebec, Canada

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Abstract

In this study, a methodology combining some state-of-the-art methods for the analysis of groundwater monitoring networks is proposed to test the hypothesis that it can be successfully used to assess trends in groundwater levels and their origin with minimal hydrogeological data requirements. The methodology first employs trend detection methods, namely the trend-free prewhitening Mann–Kendall test and a bootstrap test, to explore trends; then it uses the reference hydrograph method, land-use change maps, and consultation with groundwater resource managers to understand the origin of the trends. The methodology was tested on the groundwater monitoring network of the province of Quebec, Canada. This study focuses on short-term trends, given the length of the data available. The results showed that all but one of the observation wells in the monitoring network exhibited significant upward (38%) and downward (62%) trends at the 5% statistical significance level, but that the majority of observation wells (77%) exhibited a trend amplitude of less than 3 cm/year in absolute value, the threshold below which the rate of upward or downward change is considered stable. Application of the bootstrap test validated the representativeness of the trends calculated at well scale. For 33% of the observation wells with moderate to large trends (amplitude greater than or equal to 3 cm/year in absolute value), changes in the field around the wells were identified and could explain the observed trends for half of them. For the remaining 67% of wells, no changes in the field were reported.

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Data availability

Groundwater level time series are publicly available on the Quebec Ministry of the Environment website at: https://www.environnement.gouv.qc.ca/eau/piezo/index.htm. The observation wells used in this article are listed in the Excel file in the following directory (Data section), along with the Python codes: https://doi.org/10.5281/zenodo.7933551.

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Acknowledgements

The authors would like to thank the Quebec Ministry of the Environment for the data provided.

Funding

The authors acknowledge the financial support of the Natural Science and Engineering Research Council (NSERC-federal funding) of Canada in the framework of the Individual Discovery Grant Program held by Prof. Romain Chesnaux. The financial support of Fondation de l’Université du Québec à Chicoutimi (FUQAC), Rio Tinto Graduate Scholarships Program, as well as Fonds de Recherche du Québec – Nature et Technologie (FRQNT-provincial funding) are also acknowledged.

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Authors and Affiliations

Authors

Contributions

AVDP Adombi: conceptualization, methodology, data curation, visualization, validation, writing—original draft preparation, and investigation. Romain Chesnaux: conceptualization, supervision, resources, reviewing and editing. Marie-Amélie Boucher: conceptualization, supervision, reviewing and editing.

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Correspondence to Adoubi Vincent De Paul Adombi.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Adombi, A.V., Chesnaux, R. & Boucher, MA. Toward a methodology to explore historical groundwater level trends and their origin: the case of Quebec, Canada. Environ Earth Sci 83, 183 (2024). https://doi.org/10.1007/s12665-024-11466-9

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  • DOI: https://doi.org/10.1007/s12665-024-11466-9

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